_______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.

A．An air receiver

B．An operating valve

C．An automatic valve

D．An air distributor

[单选题]（） is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.A . An air receiverB . An operating valveC . An automatic valveD . An air distributor

[单选题]Camshafts are usually driven by timing gears or （）.A . push rodsB . chain drivesC . rocker armsD . flywheel

[单选题]The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.A . reduce water temperatureB . reduce water turbulenceC . provide an air cushionD . allow for an increase in water volume as th

[单选题]An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.A . manoeuvring operationsB . bad combustionC . coolingD . mooring trial

[单选题]The oil index of main engine should be controlled to prevent it from ____ in heavy weather.A．over heatB．over speedC．over pressureD．over worn

[单选题]In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.A . jacket water outletB . cooling water pump outletC . heat exchanger outletD . expansion tank atmospheric vent

[单选题]Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.A . performanceB . horsepower outputC . fuel consumptionD . scavenge effect

[多选题] Message Driven Bean的特点包括（）A . 它是匿名的B . 它具有本地或者远程接口C . 它由容器异步调用D . 该Bean完全在一个容器范围内存活，容器管理它的生命周期和环境

[单选题]Modem engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.A . make use ofB . have made the use ofC . by means ofD . make advantage of

[单选题]Modern engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.A . are made ofB . are made fromC . make use ofD . are used to